/// <summary>
/// 8-bit packed YCbCr samples w/ 4,1 subsampling => RGB
/// </summary>
private static void putcontig8bitYCbCr41tile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
// XXX adjust bufferShift
do
{
x = width >> 2;
do
{
int Cb = buffer[offset + 4];
int Cr = buffer[offset + 5];
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 3], buffer[offset + 3], Cb, Cr);
rasterOffset += 4;
offset += 6;
}
while (--x != 0);
if ((width & 3) != 0)
{
int Cb = buffer[offset + 4];
int Cr = buffer[offset + 5];
int xx = width & 3;
if (xx == 3)
img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
if (xx == 3 || xx == 2)
img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
if (xx == 3 || xx == 2 || xx == 1)
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
rasterOffset += xx;
offset += 6;
}
rasterOffset += rasterShift;
offset += bufferShift;
}
while (--height != 0);
}
/// <summary>
/// Get a strip-organized image with
/// SamplesPerPixel > 1
/// PlanarConfiguration separated
/// We assume that all such images are RGB.
/// </summary>
private static bool gtStripSeparate(TiffRgbaImage img, int[] raster, int offset, int width, int height)
{
int stripsize = img.tif.StripSize();
byte[] buf = new byte[(img.alpha != 0 ? 4 : 3) * stripsize];
int p0 = 0;
int p1 = p0 + stripsize;
int p2 = p1 + stripsize;
int pa = p2 + stripsize;
pa = (img.alpha != 0 ? (p2 + stripsize) : -1);
int flip = img.setorientation();
int y;
int rasterShift;
if ((flip & FLIP_VERTICALLY) != 0)
{
y = height - 1;
rasterShift = -(width + width);
}
else
{
y = 0;
rasterShift = -(width - width);
}
FieldValue[] result = img.tif.GetFieldDefaulted(TiffTag.ROWSPERSTRIP);
int rowsperstrip = result[0].ToInt();
int scanline = img.tif.ScanlineSize();
int bufferShift = (width < img.width ? img.width - width : 0);
bool ret = true;
for (int row = 0; row < height; )
{
int rowstoread = rowsperstrip - (row + img.row_offset) % rowsperstrip;
int nrow = (row + rowstoread > height ? height - row : rowstoread);
int offset_row = row + img.row_offset;
if (img.tif.ReadEncodedStrip(img.tif.ComputeStrip(offset_row, 0), buf, p0, ((row + img.row_offset) % rowsperstrip + nrow) * scanline) < 0 && img.stoponerr)
{
ret = false;
break;
}
if (img.tif.ReadEncodedStrip(img.tif.ComputeStrip(offset_row, 1), buf, p1, ((row + img.row_offset) % rowsperstrip + nrow) * scanline) < 0 && img.stoponerr)
{
ret = false;
break;
}
if (img.tif.ReadEncodedStrip(img.tif.ComputeStrip(offset_row, 2), buf, p2, ((row + img.row_offset) % rowsperstrip + nrow) * scanline) < 0 && img.stoponerr)
{
ret = false;
break;
}
if (img.alpha != 0)
{
if ((img.tif.ReadEncodedStrip(img.tif.ComputeStrip(offset_row, 3), buf, pa, ((row + img.row_offset) % rowsperstrip + nrow) * scanline) < 0 && img.stoponerr))
{
ret = false;
break;
}
}
int pos = ((row + img.row_offset) % rowsperstrip) * scanline;
img.putSeparate(img, raster, offset + y * width, rasterShift,
0, y, width, nrow,
buf, p0 + pos, p1 + pos, p2 + pos, img.alpha != 0 ? (pa + pos) : -1, bufferShift);
y += (flip & FLIP_VERTICALLY) != 0 ? -nrow : nrow;
row += nrow;
}
if ((flip & FLIP_HORIZONTALLY) != 0)
{
for (int line = 0; line < height; line++)
{
int left = offset + line * width;
int right = left + width - 1;
while (left < right)
{
int temp = raster[left];
raster[left] = raster[right];
raster[right] = temp;
left++;
right--;
}
}
}
return ret;
}
/// <summary>
/// 8-bit packed YCbCr samples w/ 4,2 subsampling => RGB
/// </summary>
private static void putcontig8bitYCbCr42tile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int rasterOffset2 = rasterOffset + width + rasterShift;
int incr = 2 * rasterShift + width;
bufferShift = (bufferShift * 10) / 4;
if ((height & 3) == 0 && (width & 1) == 0)
{
for (; height >= 2; height -= 2)
{
x = width >> 2;
do
{
int Cb = buffer[offset + 8];
int Cr = buffer[offset + 9];
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 3], buffer[offset + 3], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 0], buffer[offset + 4], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 1], buffer[offset + 5], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 2], buffer[offset + 6], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 3], buffer[offset + 7], Cb, Cr);
rasterOffset += 4;
rasterOffset2 += 4;
offset += 10;
}
while (--x != 0);
rasterOffset += incr;
rasterOffset2 += incr;
offset += bufferShift;
}
}
else
{
while (height > 0)
{
for (x = width; x > 0; )
{
int Cb = buffer[offset + 8];
int Cr = buffer[offset + 9];
bool x_goOn = false;
if (x < 1 || x > 3)
{
if (height != 1)
img.YCbCrtoRGB(out raster[rasterOffset2 + 3], buffer[offset + 7], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 3], buffer[offset + 3], Cb, Cr);
x_goOn = true;
}
if (x == 3 || x_goOn)
{
if (height != 1)
img.YCbCrtoRGB(out raster[rasterOffset2 + 2], buffer[offset + 6], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
x_goOn = true;
}
if (x == 2 || x_goOn)
{
if (height != 1)
img.YCbCrtoRGB(out raster[rasterOffset2 + 1], buffer[offset + 5], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
x_goOn = true;
}
if (x == 1 || x_goOn)
{
if (height != 1)
img.YCbCrtoRGB(out raster[rasterOffset2 + 0], buffer[offset + 4], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
}
if (x < 4)
{
rasterOffset += x;
rasterOffset2 += x;
x = 0;
}
else
{
rasterOffset += 4;
rasterOffset2 += 4;
x -= 4;
}
offset += 10;
}
if (height <= 2)
break;
height -= 2;
rasterOffset += incr;
rasterOffset2 += incr;
offset += bufferShift;
}
}
}
/// <summary>
/// Creates new instance of the <see cref="TiffRgbaImage"/> class.
/// </summary>
/// <param name="tif">
/// The instance of the <see cref="BitMiracle.LibTiff.Classic"/> class used to retrieve
/// image data.
/// </param>
/// <param name="stopOnError">
/// if set to <c>true</c> then an error will terminate the conversion; otherwise "get"
/// methods will continue processing data until all the possible data in the image have
/// been requested.
/// </param>
/// <param name="errorMsg">The error message (if any) gets placed here.</param>
/// <returns>
/// New instance of the <see cref="TiffRgbaImage"/> class if the image specified
/// by <paramref name="tif"/> can be converted to RGBA format; otherwise, <c>null</c> is
/// returned and <paramref name="errorMsg"/> contains the reason why it is being
/// rejected.
/// </returns>
public static TiffRgbaImage Create(Tiff tif, bool stopOnError, out string errorMsg)
{
errorMsg = null;
// Initialize to normal values
TiffRgbaImage img = new TiffRgbaImage();
img.row_offset = 0;
img.col_offset = 0;
img.redcmap = null;
img.greencmap = null;
img.bluecmap = null;
img.req_orientation = Orientation.BOTLEFT; // It is the default
img.tif = tif;
img.stoponerr = stopOnError;
FieldValue[] result = tif.GetFieldDefaulted(TiffTag.BITSPERSAMPLE);
img.bitspersample = result[0].ToShort();
switch (img.bitspersample)
{
case 1:
case 2:
case 4:
case 8:
case 16:
break;
default:
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle images with {0}-bit samples", img.bitspersample);
return null;
}
img.alpha = 0;
result = tif.GetFieldDefaulted(TiffTag.SAMPLESPERPIXEL);
img.samplesperpixel = result[0].ToShort();
result = tif.GetFieldDefaulted(TiffTag.EXTRASAMPLES);
short extrasamples = result[0].ToShort();
byte[] sampleinfo = result[1].ToByteArray();
if (extrasamples >= 1)
{
switch ((ExtraSample)sampleinfo[0])
{
case ExtraSample.UNSPECIFIED:
if (img.samplesperpixel > 3)
{
// Workaround for some images without correct info about alpha channel
img.alpha = ExtraSample.ASSOCALPHA;
}
break;
case ExtraSample.ASSOCALPHA:
// data is pre-multiplied
case ExtraSample.UNASSALPHA:
// data is not pre-multiplied
img.alpha = (ExtraSample)sampleinfo[0];
break;
}
}
if (Tiff.DEFAULT_EXTRASAMPLE_AS_ALPHA)
{
result = tif.GetField(TiffTag.PHOTOMETRIC);
if (result == null)
img.photometric = Photometric.MINISWHITE;
if (extrasamples == 0 && img.samplesperpixel == 4 && img.photometric == Photometric.RGB)
{
img.alpha = ExtraSample.ASSOCALPHA;
extrasamples = 1;
}
}
int colorchannels = img.samplesperpixel - extrasamples;
result = tif.GetFieldDefaulted(TiffTag.COMPRESSION);
Compression compress = (Compression)result[0].ToInt();
result = tif.GetFieldDefaulted(TiffTag.PLANARCONFIG);
PlanarConfig planarconfig = (PlanarConfig)result[0].ToShort();
result = tif.GetField(TiffTag.PHOTOMETRIC);
if (result == null)
{
switch (colorchannels)
{
case 1:
if (img.isCCITTCompression())
img.photometric = Photometric.MINISWHITE;
else
img.photometric = Photometric.MINISBLACK;
break;
case 3:
img.photometric = Photometric.RGB;
break;
default:
errorMsg = string.Format(CultureInfo.InvariantCulture, "Missing needed {0} tag", photoTag);
return null;
}
}
else
img.photometric = (Photometric)result[0].ToInt();
switch (img.photometric)
{
case Photometric.PALETTE:
result = tif.GetField(TiffTag.COLORMAP);
if (result == null)
{
errorMsg = string.Format(CultureInfo.InvariantCulture, "Missing required \"Colormap\" tag");
return null;
}
short[] red_orig = result[0].ToShortArray();
short[] green_orig = result[1].ToShortArray();
short[] blue_orig = result[2].ToShortArray();
// copy the colormaps so we can modify them
int n_color = (1 << img.bitspersample);
img.redcmap = new ushort[n_color];
img.greencmap = new ushort[n_color];
img.bluecmap = new ushort[n_color];
Buffer.BlockCopy(red_orig, 0, img.redcmap, 0, n_color * sizeof(ushort));
Buffer.BlockCopy(green_orig, 0, img.greencmap, 0, n_color * sizeof(ushort));
Buffer.BlockCopy(blue_orig, 0, img.bluecmap, 0, n_color * sizeof(ushort));
if (planarconfig == PlanarConfig.CONTIG &&
img.samplesperpixel != 1 && img.bitspersample < 8)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle contiguous data with {0}={1}, and {2}={3} and Bits/Sample={4}",
photoTag, img.photometric, "Samples/pixel", img.samplesperpixel, img.bitspersample);
return null;
}
break;
case Photometric.MINISWHITE:
case Photometric.MINISBLACK:
if (planarconfig == PlanarConfig.CONTIG &&
img.samplesperpixel != 1 && img.bitspersample < 8)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle contiguous data with {0}={1}, and {2}={3} and Bits/Sample={4}",
photoTag, img.photometric, "Samples/pixel", img.samplesperpixel, img.bitspersample);
return null;
}
break;
case Photometric.YCBCR:
// It would probably be nice to have a reality check here.
if (planarconfig == PlanarConfig.CONTIG)
{
// can rely on LibJpeg.Net to convert to RGB
// XXX should restore current state on exit
switch (compress)
{
case Compression.JPEG:
// TODO: when complete tests verify complete desubsampling and
// YCbCr handling, remove use of JPEGCOLORMODE in favor of native
// handling
tif.SetField(TiffTag.JPEGCOLORMODE, JpegColorMode.RGB);
img.photometric = Photometric.RGB;
break;
default:
// do nothing
break;
}
}
// TODO: if at all meaningful and useful, make more complete support check
// here, or better still, refactor to let supporting code decide whether there
// is support and what meaningfull error to return
break;
case Photometric.RGB:
if (colorchannels < 3)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle RGB image with {0}={1}", "Color channels", colorchannels);
return null;
}
break;
case Photometric.SEPARATED:
result = tif.GetFieldDefaulted(TiffTag.INKSET);
InkSet inkset = (InkSet)result[0].ToByte();
if (inkset != InkSet.CMYK)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle separated image with {0}={1}", "InkSet", inkset);
return null;
}
if (img.samplesperpixel < 4)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle separated image with {0}={1}", "Samples/pixel", img.samplesperpixel);
return null;
}
break;
case Photometric.LOGL:
if (compress != Compression.SGILOG)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, LogL data must have {0}={1}", "Compression", Compression.SGILOG);
return null;
}
tif.SetField(TiffTag.SGILOGDATAFMT, 3); // 8-bit RGB monitor values.
img.photometric = Photometric.MINISBLACK; // little white lie
img.bitspersample = 8;
break;
case Photometric.LOGLUV:
if (compress != Compression.SGILOG && compress != Compression.SGILOG24)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, LogLuv data must have {0}={1} or {2}", "Compression", Compression.SGILOG, Compression.SGILOG24);
return null;
}
if (planarconfig != PlanarConfig.CONTIG)
{
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle LogLuv images with {0}={1}", "Planarconfiguration", planarconfig);
return null;
}
tif.SetField(TiffTag.SGILOGDATAFMT, 3); // 8-bit RGB monitor values.
img.photometric = Photometric.RGB; // little white lie
img.bitspersample = 8;
break;
case Photometric.CIELAB:
break;
default:
errorMsg = string.Format(CultureInfo.InvariantCulture,
"Sorry, can not handle image with {0}={1}", photoTag, img.photometric);
return null;
}
img.Map = null;
img.BWmap = null;
img.PALmap = null;
img.ycbcr = null;
img.cielab = null;
result = tif.GetField(TiffTag.IMAGEWIDTH);
img.width = result[0].ToInt();
result = tif.GetField(TiffTag.IMAGELENGTH);
img.height = result[0].ToInt();
result = tif.GetFieldDefaulted(TiffTag.ORIENTATION);
img.orientation = (Orientation)result[0].ToByte();
img.isContig = !(planarconfig == PlanarConfig.SEPARATE && colorchannels > 1);
if (img.isContig)
{
if (!img.pickContigCase())
{
errorMsg = "Sorry, can not handle image";
return null;
}
}
else
{
if (!img.pickSeparateCase())
{
errorMsg = "Sorry, can not handle image";
return null;
}
}
return img;
}
///////////////////////////////////////////////////////////////////////////////////////////
// Untested methods
//
// This methods are untested (and, probably, should be deleted).
//
// pickContigCase implicitly *excludes* putRGBcontig8bitCMYKMaptile from possible "put"
// methods when it requires images to have Photometric.SEPARATED *and* 8-bit
// samples *and* a Map to use putRGBcontig8bitCMYKMaptile. The problem is:
// no Map is ever built for Photometric.SEPARATED *and* 8-bit samples.
/// <summary>
/// 8-bit packed CMYK samples w/Map => RGB
/// NB: The conversion of CMYK->RGB is *very* crude.
/// </summary>
private static void putRGBcontig8bitCMYKMaptile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int samplesperpixel = img.samplesperpixel;
byte[] Map = img.Map;
bufferShift *= samplesperpixel;
while (height-- > 0)
{
for (x = width; x-- > 0; )
{
short k = (short)(255 - buffer[offset + 3]);
short r = (short)((k * (255 - buffer[offset])) / 255);
short g = (short)((k * (255 - buffer[offset + 1])) / 255);
short b = (short)((k * (255 - buffer[offset + 2])) / 255);
raster[rasterOffset] = PACK(Map[r], Map[g], Map[b]);
rasterOffset++;
offset += samplesperpixel;
}
offset += bufferShift;
rasterOffset += rasterShift;
}
}
/// <summary>
/// 8-bit unpacked samples => RGBA w/ associated alpha
/// </summary>
private static void putRGBAAseparate8bittile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height,
byte[] buffer, int offset1, int offset2, int offset3, int offset4, int bufferShift)
{
while (height-- > 0)
{
int _x;
for (_x = width; _x >= 8; _x -= 8)
{
for (int rc = 0; rc < 8; rc++)
{
raster[rasterOffset] = PACK4(buffer[offset1], buffer[offset2], buffer[offset3], buffer[offset4]);
rasterOffset++;
offset1++;
offset2++;
offset3++;
offset4++;
}
}
if (_x > 0)
{
if (_x <= 7 && _x > 0)
{
for (int i = _x; i > 0; i--)
{
raster[rasterOffset] = PACK4(buffer[offset1], buffer[offset2], buffer[offset3], buffer[offset4]);
rasterOffset++;
offset1++;
offset2++;
offset3++;
offset4++;
}
}
}
offset1 += bufferShift;
offset2 += bufferShift;
offset3 += bufferShift;
offset4 += bufferShift;
rasterOffset += rasterShift;
}
}
/// <summary>
/// 16-bit unpacked samples => RGBA w/ associated alpha
/// </summary>
private static void putRGBAAseparate16bittile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height,
byte[] buffer, int offset1, int offset2, int offset3, int offset4, int bufferShift)
{
short[] wrgba = Tiff.ByteArrayToShorts(buffer, 0, buffer.Length);
offset1 /= sizeof(short);
offset2 /= sizeof(short);
offset3 /= sizeof(short);
offset4 /= sizeof(short);
while (height-- > 0)
{
for (x = 0; x < width; x++)
{
raster[rasterOffset] = PACKW4(wrgba[offset1], wrgba[offset2], wrgba[offset3], wrgba[offset4]);
rasterOffset++;
offset1++;
offset2++;
offset3++;
offset4++;
}
offset1 += bufferShift;
offset2 += bufferShift;
offset3 += bufferShift;
offset4 += bufferShift;
rasterOffset += rasterShift;
}
}
/// <summary>
/// 8-bit packed samples => RGBA w/ associated alpha (known to have Map == null)
/// </summary>
private static void putRGBAAcontig8bittile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int samplesperpixel = img.samplesperpixel;
bufferShift *= samplesperpixel;
while (height-- > 0)
{
int _x;
for (_x = width; _x >= 8; _x -= 8)
{
for (int rc = 0; rc < 8; rc++)
{
raster[rasterOffset] = PACK4(buffer[offset], buffer[offset + 1], buffer[offset + 2], buffer[offset + 3]);
rasterOffset++;
offset += samplesperpixel;
}
}
if (_x > 0)
{
if (_x <= 7 && _x > 0)
{
for (int i = _x; i > 0; i--)
{
raster[rasterOffset] = PACK4(buffer[offset], buffer[offset + 1], buffer[offset + 2], buffer[offset + 3]);
rasterOffset++;
offset += samplesperpixel;
}
}
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 8-bit packed samples => RGBA w/ unassociated alpha (known to have Map == null)
/// </summary>
private static void putRGBUAcontig8bittile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int samplesperpixel = img.samplesperpixel;
bufferShift *= samplesperpixel;
while (height-- > 0)
{
for (x = width; x-- > 0; )
{
int a = buffer[offset + 3];
int r = (buffer[offset] * a + 127) / 255;
int g = (buffer[offset + 1] * a + 127) / 255;
int b = (buffer[offset + 2] * a + 127) / 255;
raster[rasterOffset] = PACK4(r, g, b, a);
rasterOffset++;
offset += samplesperpixel;
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 2-bit greyscale => colormap/RGB
/// </summary>
private static void put2bitbwtile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int[][] BWmap = img.BWmap;
bufferShift /= 4;
while (height-- > 0)
{
int[] bw = null;
int _x;
for (_x = width; _x >= 4; _x -= 4)
{
bw = BWmap[buffer[offset]];
offset++;
for (int rc = 0; rc < 4; rc++)
{
raster[rasterOffset] = bw[rc];
rasterOffset++;
}
}
if (_x > 0)
{
bw = BWmap[buffer[offset]];
offset++;
if (_x <= 3 && _x > 0)
{
for (int i = 0; i < _x; i++)
{
raster[rasterOffset] = bw[i];
rasterOffset++;
}
}
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 4-bit greyscale => colormap/RGB
/// </summary>
private static void put4bitbwtile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int[][] BWmap = img.BWmap;
bufferShift /= 2;
while (height-- > 0)
{
int[] bw = null;
int _x;
for (_x = width; _x >= 2; _x -= 2)
{
bw = BWmap[buffer[offset]];
offset++;
for (int rc = 0; rc < 2; rc++)
{
raster[rasterOffset] = bw[rc];
rasterOffset++;
}
}
if (_x != 0)
{
bw = BWmap[buffer[offset]];
offset++;
raster[rasterOffset] = bw[0];
rasterOffset++;
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 16-bit greyscale => colormap/RGB
/// </summary>
private static void put16bitbwtile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int samplesperpixel = img.samplesperpixel;
int[][] BWmap = img.BWmap;
while (height-- > 0)
{
short[] wp = Tiff.ByteArrayToShorts(buffer, offset, buffer.Length - offset);
int wpPos = 0;
for (x = width; x-- > 0; )
{
// use high order byte of 16bit value
raster[rasterOffset] = BWmap[(wp[wpPos] & 0xffff) >> 8][0];
rasterOffset++;
offset += 2 * samplesperpixel;
wpPos += samplesperpixel;
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 8-bit greyscale => colormap/RGB
/// </summary>
private static void putgreytile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int samplesperpixel = img.samplesperpixel;
int[][] BWmap = img.BWmap;
while (height-- > 0)
{
for (x = width; x-- > 0; )
{
raster[rasterOffset] = BWmap[buffer[offset]][0];
rasterOffset++;
offset += samplesperpixel;
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 1-bit palette => colormap/RGB
/// </summary>
private static void put1bitcmaptile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int[][] PALmap = img.PALmap;
bufferShift /= 8;
while (height-- > 0)
{
int[] bw;
int bwPos = 0;
int _x;
for (_x = width; _x >= 8; _x -= 8)
{
bw = PALmap[buffer[offset++]];
bwPos = 0;
for (int i = 0; i < 8; i++)
raster[rasterOffset++] = bw[bwPos++];
}
if (_x > 0)
{
bw = PALmap[buffer[offset++]];
bwPos = 0;
if (_x <= 7 && _x > 0)
{
for (int i = 0; i < _x; i++)
raster[rasterOffset++] = bw[bwPos++];
}
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 8-bit packed YCbCr samples w/ no subsampling => RGB
/// </summary>
private static void putcontig8bitYCbCr11tile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
bufferShift *= 3;
do
{
x = width; // was x = w >> 1; patched 2000/09/25 [email protected]
do
{
int Cb = buffer[offset + 1];
int Cr = buffer[offset + 2];
img.YCbCrtoRGB(out raster[rasterOffset], buffer[offset + 0], Cb, Cr);
rasterOffset++;
offset += 3;
}
while (--x != 0);
rasterOffset += rasterShift;
offset += bufferShift;
}
while (--height != 0);
}
/// <summary>
/// 16-bit packed samples => RGBA w/ unassociated alpha (known to have Map == null)
/// </summary>
private static void putRGBUAcontig16bittile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int samplesperpixel = img.samplesperpixel;
bufferShift *= samplesperpixel;
short[] wp = Tiff.ByteArrayToShorts(buffer, offset, buffer.Length);
int wpPos = 0;
while (height-- > 0)
{
for (x = width; x-- > 0; )
{
int a = W2B(wp[wpPos + 3]);
int r = (W2B(wp[wpPos]) * a + 127) / 255;
int g = (W2B(wp[wpPos + 1]) * a + 127) / 255;
int b = (W2B(wp[wpPos + 2]) * a + 127) / 255;
raster[rasterOffset] = PACK4(r, g, b, a);
rasterOffset++;
wpPos += samplesperpixel;
}
rasterOffset += rasterShift;
wpPos += bufferShift;
}
}
/// <summary>
/// 8-bit packed YCbCr samples w/ 1,2 subsampling => RGB
/// </summary>
private static void putcontig8bitYCbCr12tile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
bufferShift = (bufferShift / 2) * 4;
int rasterOffset2 = rasterOffset + width + rasterShift;
while (height >= 2)
{
x = width;
do
{
int Cb = buffer[offset + 2];
int Cr = buffer[offset + 3];
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 0], buffer[offset + 1], Cb, Cr);
rasterOffset++;
rasterOffset2++;
offset += 4;
} while (--x != 0);
rasterOffset += rasterShift * 2 + width;
rasterOffset2 += rasterShift * 2 + width;
offset += bufferShift;
height -= 2;
}
if (height == 1)
{
x = width;
do
{
int Cb = buffer[offset + 2];
int Cr = buffer[offset + 3];
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
rasterOffset++;
offset += 4;
} while (--x != 0);
}
}
/// <summary>
/// 8-bit packed CMYK samples w/o Map => RGB.
/// NB: The conversion of CMYK->RGB is *very* crude.
/// </summary>
private static void putRGBcontig8bitCMYKtile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int samplesperpixel = img.samplesperpixel;
bufferShift *= samplesperpixel;
while (height-- > 0)
{
int _x;
for (_x = width; _x >= 8; _x -= 8)
{
for (int rc = 0; rc < 8; rc++)
{
short k = (short)(255 - buffer[offset + 3]);
short r = (short)((k * (255 - buffer[offset])) / 255);
short g = (short)((k * (255 - buffer[offset + 1])) / 255);
short b = (short)((k * (255 - buffer[offset + 2])) / 255);
raster[rasterOffset] = PACK(r, g, b);
rasterOffset++;
offset += samplesperpixel;
}
}
if (_x > 0)
{
if (_x <= 7 && _x > 0)
{
for (int i = _x; i > 0; i--)
{
short k = (short)(255 - buffer[offset + 3]);
short r = (short)((k * (255 - buffer[offset])) / 255);
short g = (short)((k * (255 - buffer[offset + 1])) / 255);
short b = (short)((k * (255 - buffer[offset + 2])) / 255);
raster[rasterOffset] = PACK(r, g, b);
rasterOffset++;
offset += samplesperpixel;
}
}
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 8-bit unpacked samples => RGBA w/ unassociated alpha
/// </summary>
private static void putRGBUAseparate8bittile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height,
byte[] buffer, int offset1, int offset2, int offset3, int offset4, int bufferShift)
{
while (height-- > 0)
{
for (x = width; x-- > 0; )
{
int av = buffer[offset4];
int rv = (buffer[offset1] * av + 127) / 255;
int gv = (buffer[offset2] * av + 127) / 255;
int bv = (buffer[offset3] * av + 127) / 255;
raster[rasterOffset] = PACK4(rv, gv, bv, av);
rasterOffset++;
offset1++;
offset2++;
offset3++;
offset4++;
}
offset1 += bufferShift;
offset2 += bufferShift;
offset3 += bufferShift;
offset4 += bufferShift;
rasterOffset += rasterShift;
}
}
/// <summary>
/// 8-bit packed CIE L*a*b 1976 samples => RGB
/// </summary>
private static void putcontig8bitCIELab(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
bufferShift *= 3;
while (height-- > 0)
{
for (x = width; x-- > 0; )
{
float X, Y, Z;
img.cielab.CIELabToXYZ(buffer[offset], (sbyte)buffer[offset + 1], (sbyte)buffer[offset + 2], out X, out Y, out Z);
int r, g, b;
img.cielab.XYZToRGB(X, Y, Z, out r, out g, out b);
raster[rasterOffset] = PACK(r, g, b);
rasterOffset++;
offset += 3;
}
rasterOffset += rasterShift;
offset += bufferShift;
}
}
/// <summary>
/// 16-bit unpacked samples => RGBA w/ unassociated alpha
/// </summary>
private static void putRGBUAseparate16bittile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height,
byte[] buffer, int offset1, int offset2, int offset3, int offset4, int bufferShift)
{
short[] wrgba = Tiff.ByteArrayToShorts(buffer, 0, buffer.Length);
offset1 /= sizeof(short);
offset2 /= sizeof(short);
offset3 /= sizeof(short);
offset4 /= sizeof(short);
while (height-- > 0)
{
for (x = width; x-- > 0; )
{
int a = W2B(wrgba[offset4]);
int r = (W2B(wrgba[offset1]) * a + 127) / 255;
int g = (W2B(wrgba[offset2]) * a + 127) / 255;
int b = (W2B(wrgba[offset3]) * a + 127) / 255;
raster[rasterOffset] = PACK4(r, g, b, a);
rasterOffset++;
offset1++;
offset2++;
offset3++;
offset4++;
}
offset1 += bufferShift;
offset2 += bufferShift;
offset3 += bufferShift;
offset4 += bufferShift;
rasterOffset += rasterShift;
}
}
/// <summary>
/// 8-bit packed YCbCr samples w/ 2,1 subsampling => RGB
/// </summary>
private static void putcontig8bitYCbCr21tile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
bufferShift = (bufferShift * 4) / 2;
do
{
x = width >> 1;
do
{
int Cb = buffer[offset + 2];
int Cr = buffer[offset + 3];
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
rasterOffset += 2;
offset += 4;
}
while (--x != 0);
if ((width & 1) != 0)
{
int Cb = buffer[offset + 2];
int Cr = buffer[offset + 3];
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
rasterOffset += 1;
offset += 4;
}
rasterOffset += rasterShift;
offset += bufferShift;
}
while (--height != 0);
}
/// <summary>
/// 8-bit packed YCbCr samples w/ no subsampling => RGB
/// </summary>
private static void putseparate8bitYCbCr11tile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height,
byte[] buffer, int offset1, int offset2, int offset3, int offset4, int bufferShift)
{
while (height-- > 0)
{
x = width;
do
{
int r, g, b;
img.ycbcr.YCbCrtoRGB(buffer[offset1], buffer[offset2], buffer[offset3], out r, out g, out b);
raster[rasterOffset] = PACK(r, g, b);
rasterOffset++;
offset1++;
offset2++;
offset3++;
} while (--x != 0);
offset1 += bufferShift;
offset2 += bufferShift;
offset3 += bufferShift;
rasterOffset += rasterShift;
}
}
/// <summary>
/// 8-bit packed YCbCr samples w/ 4,4 subsampling => RGB
/// </summary>
private static void putcontig8bitYCbCr44tile(
TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
{
int rasterOffset1 = rasterOffset + width + rasterShift;
int rasterOffset2 = rasterOffset1 + width + rasterShift;
int rasterOffset3 = rasterOffset2 + width + rasterShift;
int incr = 3 * width + 4 * rasterShift;
// adjust bufferShift
bufferShift = (bufferShift * 18) / 4;
if ((height & 3) == 0 && (width & 3) == 0)
{
for (; height >= 4; height -= 4)
{
x = width >> 2;
do
{
int Cb = buffer[offset + 16];
int Cr = buffer[offset + 17];
img.YCbCrtoRGB(out raster[rasterOffset], buffer[offset + 0], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset + 3], buffer[offset + 3], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset1 + 0], buffer[offset + 4], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset1 + 1], buffer[offset + 5], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset1 + 2], buffer[offset + 6], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset1 + 3], buffer[offset + 7], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 0], buffer[offset + 8], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 1], buffer[offset + 9], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 2], buffer[offset + 10], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset2 + 3], buffer[offset + 11], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset3 + 0], buffer[offset + 12], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset3 + 1], buffer[offset + 13], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset3 + 2], buffer[offset + 14], Cb, Cr);
img.YCbCrtoRGB(out raster[rasterOffset3 + 3], buffer[offset + 15], Cb, Cr);
rasterOffset += 4;
rasterOffset1 += 4;
rasterOffset2 += 4;
rasterOffset3 += 4;
offset += 18;
}
while (--x != 0);
rasterOffset += incr;
rasterOffset1 += incr;
rasterOffset2 += incr;
rasterOffset3 += incr;
offset += bufferShift;
}
}
else
{
while (height > 0)
{
for (x = width; x > 0; )
{
int Cb = buffer[offset + 16];
int Cr = buffer[offset + 17];
bool h_goOn = false;
bool x_goOn = false;
// order of if's is important
if (x < 1 || x > 3)
{
// order of if's is important
h_goOn = false;
if (height < 1 || height > 3)
{
img.YCbCrtoRGB(out raster[rasterOffset3 + 3], buffer[offset + 15], Cb, Cr);
h_goOn = true;
}
if (height == 3 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset2 + 3], buffer[offset + 11], Cb, Cr);
h_goOn = true;
}
if (height == 2 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset1 + 3], buffer[offset + 7], Cb, Cr);
h_goOn = true;
}
if (height == 1 || h_goOn)
img.YCbCrtoRGB(out raster[rasterOffset + 3], buffer[offset + 3], Cb, Cr);
x_goOn = true;
}
if (x == 3 || x_goOn)
{
// order of if's is important
h_goOn = false;
if (height < 1 || height > 3)
{
img.YCbCrtoRGB(out raster[rasterOffset3 + 2], buffer[offset + 14], Cb, Cr);
h_goOn = true;
}
if (height == 3 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset2 + 2], buffer[offset + 10], Cb, Cr);
h_goOn = true;
}
if (height == 2 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset1 + 2], buffer[offset + 6], Cb, Cr);
h_goOn = true;
}
if (height == 1 || h_goOn)
img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
x_goOn = true;
}
if (x == 2 || x_goOn)
{
// order of if's is important
h_goOn = false;
if (height < 1 || height > 3)
{
img.YCbCrtoRGB(out raster[rasterOffset3 + 1], buffer[offset + 13], Cb, Cr);
h_goOn = true;
}
if (height == 3 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset2 + 1], buffer[offset + 9], Cb, Cr);
h_goOn = true;
}
if (height == 2 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset1 + 1], buffer[offset + 5], Cb, Cr);
h_goOn = true;
}
if (height == 1 || h_goOn)
img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
}
if (x == 1 || x_goOn)
{
// order of if's is important
h_goOn = false;
if (height < 1 || height > 3)
{
img.YCbCrtoRGB(out raster[rasterOffset3 + 0], buffer[offset + 12], Cb, Cr);
h_goOn = true;
}
if (height == 3 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset2 + 0], buffer[offset + 8], Cb, Cr);
h_goOn = true;
}
if (height == 2 || h_goOn)
{
img.YCbCrtoRGB(out raster[rasterOffset1 + 0], buffer[offset + 4], Cb, Cr);
h_goOn = true;
}
if (height == 1 || h_goOn)
img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
}
if (x < 4)
{
rasterOffset += x;
rasterOffset1 += x;
rasterOffset2 += x;
rasterOffset3 += x;
x = 0;
}
else
{
rasterOffset += 4;
rasterOffset1 += 4;
rasterOffset2 += 4;
rasterOffset3 += 4;
x -= 4;
}
offset += 18;
}
if (height <= 4)
break;
height -= 4;
rasterOffset += incr;
rasterOffset1 += incr;
rasterOffset2 += incr;
rasterOffset3 += incr;
offset += bufferShift;
}
}
}
/// <summary>
/// Get an tile-organized image that has
/// SamplesPerPixel > 1
/// PlanarConfiguration separated
/// We assume that all such images are RGB.
/// </summary>
private static bool gtTileSeparate(TiffRgbaImage img, int[] raster, int offset, int width, int height)
{
int tilesize = img.tif.TileSize();
byte[] buf = new byte[(img.alpha != 0 ? 4 : 3) * tilesize];
int p0 = 0;
int p1 = p0 + tilesize;
int p2 = p1 + tilesize;
int pa = (img.alpha != 0 ? (p2 + tilesize) : -1);
FieldValue[] result = img.tif.GetField(TiffTag.TILEWIDTH);
int tileWidth = result[0].ToInt();
result = img.tif.GetField(TiffTag.TILELENGTH);
int tileHeight = result[0].ToInt();
int flip = img.setorientation();
int y;
int rasterShift;
if ((flip & FLIP_VERTICALLY) != 0)
{
y = height - 1;
rasterShift = -(tileWidth + width);
}
else
{
y = 0;
rasterShift = -(tileWidth - width);
}
bool ret = true;
for (int row = 0; row < height; )
{
int rowstoread = tileHeight - (row + img.row_offset) % tileHeight;
int nrow = (row + rowstoread > height ? height - row : rowstoread);
for (int col = 0; col < width; col += tileWidth)
{
if (img.tif.ReadTile(buf, p0, col + img.col_offset, row + img.row_offset, 0, 0) < 0 && img.stoponerr)
{
ret = false;
break;
}
if (img.tif.ReadTile(buf, p1, col + img.col_offset, row + img.row_offset, 0, 1) < 0 && img.stoponerr)
{
ret = false;
break;
}
if (img.tif.ReadTile(buf, p2, col + img.col_offset, row + img.row_offset, 0, 2) < 0 && img.stoponerr)
{
ret = false;
break;
}
if (img.alpha != 0)
{
if (img.tif.ReadTile(buf, pa, col + img.col_offset, row + img.row_offset, 0, 3) < 0 && img.stoponerr)
{
ret = false;
break;
}
}
int pos = ((row + img.row_offset) % tileHeight) * img.tif.TileRowSize();
if (col + tileWidth > width)
{
// Tile is clipped horizontally.
// Calculate visible portion and skewing factors.
int npix = width - col;
int bufferShift = tileWidth - npix;
img.putSeparate(img, raster, offset + y * width + col, rasterShift + bufferShift,
col, y, npix, nrow,
buf, p0 + pos, p1 + pos, p2 + pos, img.alpha != 0 ? (pa + pos) : -1, bufferShift);
}
else
{
img.putSeparate(img, raster, offset + y * width + col, rasterShift,
col, y, tileWidth, nrow,
buf, p0 + pos, p1 + pos, p2 + pos, img.alpha != 0 ? (pa + pos) : -1, 0);
}
}
y += ((flip & FLIP_VERTICALLY) != 0 ? -nrow : nrow);
row += nrow;
}
if ((flip & FLIP_HORIZONTALLY) != 0)
{
for (int line = 0; line < height; line++)
{
int left = offset + line * width;
int right = left + width - 1;
while (left < right)
{
int temp = raster[left];
raster[left] = raster[right];
raster[right] = temp;
left++;
right--;
}
}
}
return ret;
}
/// <summary>
/// Get a strip-organized image that has
/// PlanarConfiguration contiguous if SamplesPerPixel > 1
/// or
/// SamplesPerPixel == 1
/// </summary>
private static bool gtStripContig(TiffRgbaImage img, int[] raster, int offset, int width, int height)
{
byte[] buf = new byte[img.tif.StripSize()];
int flip = img.setorientation();
int y;
int rasterShift;
if ((flip & FLIP_VERTICALLY) != 0)
{
y = height - 1;
rasterShift = -(width + width);
}
else
{
y = 0;
rasterShift = -(width - width);
}
FieldValue[] result = img.tif.GetFieldDefaulted(TiffTag.ROWSPERSTRIP);
int rowsperstrip = result[0].ToInt();
if (rowsperstrip == -1)
{
// San Chen <*****@*****.**>
// HACK: should be UInt32.MaxValue
rowsperstrip = Int32.MaxValue;
}
result = img.tif.GetFieldDefaulted(TiffTag.YCBCRSUBSAMPLING);
short subsamplingver = result[1].ToShort();
int scanline = img.tif.newScanlineSize();
int bufferShift = (width < img.width ? img.width - width : 0);
bool ret = true;
for (int row = 0; row < height; )
{
int rowstoread = rowsperstrip - (row + img.row_offset) % rowsperstrip;
int nrow = (row + rowstoread > height ? height - row : rowstoread);
int nrowsub = nrow;
if ((nrowsub % subsamplingver) != 0)
nrowsub += subsamplingver - nrowsub % subsamplingver;
if (img.tif.ReadEncodedStrip(img.tif.ComputeStrip(row + img.row_offset, 0), buf, 0, ((row + img.row_offset) % rowsperstrip + nrowsub) * scanline) < 0 && img.stoponerr)
{
ret = false;
break;
}
int pos = ((row + img.row_offset) % rowsperstrip) * scanline;
img.putContig(img, raster, offset + y * width, rasterShift, 0, y, width, nrow, buf, pos, bufferShift);
y += (flip & FLIP_VERTICALLY) != 0 ? -nrow : nrow;
row += nrow;
}
if ((flip & FLIP_HORIZONTALLY) != 0)
{
for (int line = 0; line < height; line++)
{
int left = offset + line * width;
int right = left + width - 1;
while (left < right)
{
int temp = raster[left];
raster[left] = raster[right];
raster[right] = temp;
left++;
right--;
}
}
}
return ret;
}